So if skin color selection is not related to cancer, what accounts for the difference in skin color of different human populations? Meaning where is the selective pressure coming from to explain the differences in skin color?
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So if skin color selection is not related to cancer, what accounts for the difference in skin color of different human populations? Meaning where is the selective pressure coming from to explain the differences in skin color?
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Solved in 2 steps
- What is the evidence that the differences in skin color in populations around the world evolved by natural selection?Based on everything that you have learned so far, provide an explanation for how the different shades of skin color from pinkish white to dark brown evolved throughout human history.According to the video “The Biology of Skin Color”, how does skin color throughout the world match up with UV exposure? A. Lighter skin is usually found in high UV areas while darker skin is usually found in low UV areas B. Skin color throughout the world does not match up with UV exposure C. Darker skin is usually found in high UV areas while lighter skin is usually found in low UV areas D. UV rays are the same throughout the world, so there is no pattern or correlation with skin color
- Ultraviolet rays in sunlight cause skin cancer. In today’s world, people of all skin colors, but especially paleskinned people, are often urged to stay out of the sun and get their vitamin D from food or supplements. In the past, do you think that the risk of skin cancer selected against pale-skinned people, partially counterbalancing selection in favor of pale skin for vitamin D production?How is the diversity in human skin color related to human environmental adaptation?According to the video “The Biology of Skin Color”, why is lighter skin needed in areas closer to the north and south poles where UV rays are weaker? A. Individuals with a lot of melanin would get too much UV ray penetration in their skin and they wouldn't be able to synthesize vitamin D. B. Lighter skin is not necessary in the north and south poles. C. Individuals with a lot of melanin wouldn't get enough UV ray penetration in their skin to synthesize vitamin B. D. Individuals with a lot of melanin wouldn't get enough UV ray penetration in their skin to synthesize vitamin D.
- What is the possible explanation for why so many Europeans have lighter skin?How does skin color throughout the world match up with UV exposure? A. Darker skin is usually found in high UV areas while lighter skin is usually found in low UV areas B. UV rays are the same throughout the world, so there is no pattern or correlation with skin color C. Skin color throughout the world does not match up with UV exposure D. Lighter skin is usually found in high UV areas while darker skin is usually found in low UV areasWhat are the two selective pressures that lead to the pattern of skin color variation seen in populations around the world and how is they related to an increased level of fitness?
- What factors caused the correlation between the reduction in skin pigmentation in humans and migration of human populations away from the equator? The exposure of human populations to predators only common to the polar regions caused them to adapt by camouflaging better with the environment. The exposure of human populations to less UV light required a reduction in melanin to produce more vitamin D for healthier bones. The exposure of human populations to new sources of food common to the polar regions caused changes in physiology that resulted in the production of less melanin. The exposure of human populations to new diseases common to the polar regions interferred with melanin production causing lighter skin.Why is it that the evolution of skin color is considered a case of natural selection? Group of answer choices A- Because different alleles in skin color genes lead to differences in skin color B- Because differences in skin color lead to differences in number of children in different environments C- Both D- NeitherWhat do you notice is similar about the distribution of the HERC2 variant for blue eyes and the F374 allele for lighter skin pigmentation? Based on what you know about skin color and human variation, what evolutionary circumstances might have caused this distribution of the blue-eye variant?